Safety stop for motor vehicles



Sept. 20, 1932. L. ROSENFELD ET AL SAFETY STOP FOR MOTOR VEHICLES Filed Feb. 19, 1950 2 Sheets-Sheet. 1

Sept. 26, 1932. M. L. ROSENFELD ET AL 1,377,975

SAFETY STOP FOR MOTOR VEHICLES Filed Feb. 19, 1930 2 Sheets-Sheet 2 ,4. %W INVENTORS.

unwind the coil and thus allowing free movement in that direction.

7 It is provided that any shift to forward speed will raise the dog22and put the coil in operative position.

The main shift rod 27 bass. in28 Which- Iengages'theloop 26 vand raises the dog 22 on the forward shift to high speed, andthe rod has a beveled portion 29 which engages a pin 30; .on the dog 22 toraise it whenthe shift rod." is moved back to engage second gear direct" from neutral.

All the above operations are automatic on the movement of the gear shift, but a hand end of spring 20 and release the coil. from the drum 7;: In Figure 3 a pivoted lever 63 is connected to a bar 6e having a hook 6'5 to i engage the spring to release it. A suitable bearing bracket 66 is provided toguideithe" bar 6 7 andj68 are the pivotedijoints, Thecompleteoperation is as follows:

speed, and is ready to prevent the ,vehicle fromrunning backwards, but when itis de-' sirecltoback up the reverse shift throws the coil'gou t; of operation and allows thejvehicle 5 :to back freely. V The coil is held in this position untiloneofthe forward speeds are thrown in,

thrown inoperative position, 7

In the modified form shown in that slow, second orhigh, when it is again gur s Q andI 4, indicates the transmissionbox, 36

thespeedometer casing,37 the main ear shaft and 38 the taper' drum', the taper elngre- Versedfrom that shown in Figure 1.

'lhe coil sprin gjiii) has the fixed end 9&0 ad- T 5 ustable on the threaded stud bolt 41 by means 7 ofrthe nu-ts 41:2 and43,so that'just the right pressure of the spring may be had on the taper drum faCQ-- 3;In;thi s form the reverse and low shift rod 45L acts when thrown in reverse on m l-an arm 45 pivoted at l6v to pull back on adog 47. which is hooked over a lug 48 of the spring "position loy a latch 49, pivotedat 50 on the transmission box. 7

This latch has, an upwardly extending lug 51; which is adaptedto be engaged by the pin q 52 onthe roan, 'orthe pin 53 on therod 54:

on ttheir forward movements. p .s thevlug 51 is an over hanging member 55 'whichthe pin 53 engages and. raises, the

latch on the back motion, or second gear posi :ti onof the;rod, a f l The universal coupling 56 is'bolted direct to the taper drum by bolts 57.

The operation is similar to the form shown in Figures 1 and 2, the difference being that the coil end has to be pulled back tothrow it out of operation while the first described has to-be 'pushedoutward.

. 7 .Having thus described our invention what we desire to secure by Letters Patent of the UnitedState's is as follows-g -but-modificationsmay-'b-emade i-n carrying out the invention as shown incthe drawings and in the above particularlylidescribed form thereof within the p rv ew o th annex d. claims 1 We claim: a a I -'1. A'reverse safety stop for motor vehicles comprising a taper drum, a coiled-member around said drumyhavlng one end itdJllSt-V;

ably "fixed," the other end freefwhereby the drum may run-freelyin one idirectiom but beheld from rotation in the opposite direction by'the action ofs'aid coiled member tending towind up and wrap itself tightly onsaid drum, and means to 'hold said spring in inoperative position when it is" desired that the drum; run freely in, ei-ther direction;

2. A reverse safety'stopfor motor vehicles, I

The' 'spring coil is'in operative position: comprising e; 0 1 1 11 With a motor 9 when the vehicleis traveling in any forward vehicle transmission; a main "gear shaft projecting from said transmission; a taper face drumfixed on saidj shaft, a spiral spring coiled around' said drum having one end ad:

justa'bly fixed, the other end free, whereby when the shaft is rotated in one'direotion said spring will tend. to wind up on said drum and hold it from further movement, 'when free movement of the drum, and. means oper;

ated by the transmission mechanism to. hold;

said'springin inoperative position when it directionQ. s l

is desired that the shaftrun, freely in'either in-g one end ladjustablyi .fixed' andswound I said shaft is ated in the o h r direction i thespring will tendto unwind, and allow- 3. The combination" gear .shifti I 7 transmission shaft,; a drum having a; taper I face fixed on said shaft, a spiral spring hav around andiadapted to contactwith said taper face theother end of-spring being free, means tocontrol: thefree end; and intermedi ate coils ofsaid 'spring wh'ereby said spring" will grip'the drum with forceenough-to prevent "rotation in one direction; and-"light enough to allow 4. A safetystop for motor v-ehicles'coniprising in combination with at'gear shift transmission," a shaft having its direction of it torotate in either direcdrum from reverse motion, and means operated by the gear shiftto prevent said coils from wrapping around and gripping the drum when it is desired to run in reverse, and

E 15 means to automatically put the coils in operative position on any forward speed of said transmission. 7 r 5. A safety stop formotorvehicles comprising in combination with a transmission, I

a shaft operated by said transmissioma drum a spiral spring having one end adjustably fixed wound aroundon said taper face to allow free movement for the forward speeds of said transmission, but to prevent reverse movement by the automatic winding up of spring from gripping contact with said rotatable-member to allow said rotatable mem-j v ber to run'freely in either direction.

In. testimony whereof we have hereunto set our hands this 14th day of February,

A. D. 1930. p

MAX L.'ROSENFELD.'

JOHN H. MORGAN.

. fixed on said shaft, a taper faceon said drum,

said coil, and means operated'by said trans mission to prevent the winding up of said coil when it is desired to go into reverse.

6. A safety stop for motor vehicles of the class described comprising in combination a 7 transmission, a driven-reversible shaft in said transmission, a taper member on said shaft, a

spring having a'tapered Wire Wound around said tap-er member, one end of said wire being adjustably fixed, and the other end and inter mediate coils free to bear on said taper surface, whereby the rotation of said shaft will taper face memberon said rotatable member, a gripping member having one end adjust ably fixed, and the other end spirallywound around said taper face wherebysaid gripping member will tend to Wind up and grip the taper face when the rotatable member is rotated in one direction, and to tend to unwind and allow said rotatable member to rotate freely in the other direction, and means act- 7 ing on the free end of the gripping member to move said coils out of'gripping contact With said taper face. 8. A reverse stop of the class described comprising a reversible rotatable member, a

- drum having a taper face on said member, a

spiral spring having an inside tapering diameter adapted to fit said taper face, the out: side diameter of said spring being the. same" for its full length, means to adj ustably fix one end of said spring whereby the free coils of said spring will wind up tight on said taper said rotatable member is rotated in'one 'direction, and to tend to unwind and release .face and hold it from further rotation when' said rotatable member when rotated in the V opposite direction, automatic means, and hand operated means to release and hold said 

